Unravelling the physiological basis of salinity stress tolerance in cultivated and wild rice species

被引:13
作者
Shahzad, Babar [1 ]
Yun, Ping [1 ]
Shabala, Lana [1 ]
Zhou, Meixue [1 ]
Sellamuthu, Gothandapani [2 ,3 ]
Venkataraman, Gayatri [2 ]
Chen, Zhong-Hua [4 ]
Shabala, Sergey [1 ,5 ]
机构
[1] Univ Tasmania, Tasmanian Inst Agr, Hobart, Tas 7001, Australia
[2] MS Swaminathan Res Fdn, Plant Mol Biol Lab, III Cross St, Chennai 600113, Tamil Nadu, India
[3] Czech Univ Life Sci Prague, Fac Forestry & Wood Sci, Forest Mol Entomol Lab, Excellent Team Mitigat ETM, Prague 16500, Czech Republic
[4] Western Sydney Univ, Sch Sci, Hawkesbury Inst Environm, Penrith, NSW 2751, Australia
[5] Foshan Univ, Int Res Ctr Environm Membrane Biol, Foshan 528000, Peoples R China
关键词
chlorophyll content; Na+ sequestration; osmoregulation; salinity stress tolerance; stomata; tissue tolerance; wild rice; xylem ion loading; NA+/H+ ANTIPORTER SOS1; SALT TOLERANCE; PLASMA-MEMBRANE; K+ RETENTION; GENE; RESPONSES; XYLEM; HALOPHYTES; ELONGATION; MECHANISMS;
D O I
10.1071/FP21336
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Wild rice species provide a rich source of genetic diversity for possible introgression of salinity stress tolerance in cultivated rice. We investigated the physiological basis of salinity stress tolerance in Oryza species by using six rice genotypes (Oryza sativa L.) and four wild rice species. Three weeks of salinity treatment significantly (P < 0.05) reduced physiological and growth indices of all cultivated and wild rice lines. However, the impact of salinity-induced growth reduction differed substantially among accessions. Salt tolerant accessions showed better control over gas exchange properties, exhibited higher tissue tolerance, and retained higher potassium ion content despite higher sodium ion accumulation in leaves. Wild rice species showed relatively lower and steadier xylem sap sodium ion content over the period of 3 weeks analysed, suggesting better control over ionic sodium xylem loading and its delivery to shoots with efficient vacuolar sodium ion sequestration. Contrary to this, saline sensitive genotypes managed to avoid initial Na+ loading but failed to accomplish this in the long term and showed higher sap sodium ion content. Conclusively, our results suggest that wild rice genotypes have more efficient control over xylem sodium ion loading, rely on tissue tolerance mechanisms and allow for a rapid osmotic adjustment by using sodium ions as cheap osmoticum for osmoregulation.
引用
收藏
页码:351 / 364
页数:14
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